build: package: skip prioritizing deps of pkg which are a subpkg of pkg (MR 2459)

Some packages in aports have their own subpackages in their
dependencies, for some reason. This causes our resolver to assume there
is a cyclical dependency.

Adjust the resolver to safely ignore these dependencies, since they'll
be built as a part of the package that depends on them.

For example, modemmanager depends on libmm-glib which is a subpackage of
modemmanager. Currently to build modemmanager in pmaports it would be
necessary to manually modify the APKBUILD after copying it from aports.
This change avoids that.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

pmb/build/_package.py

@@ -276,6 +276,10 @@ def prioritise_build_queue(disarray: list[BuildQueueItem]) -> list[BuildQueueIte
                     raise NonBugError(f"{item['name']}: dependency not found: {dep}")
                 dep = dep_data.pkgname
 
+                # If the dependency is a subpackage we can safely ignore it
+                if dep in item["apkbuild"]["subpackages"]:
+                    continue
+
                 if dep in all_pkgnames:
                     unmet_deps.setdefault(item["name"], []).append(dep)
                     missing_deps = True